X-ray marking instrument



FIG. 1 is a perspective view of an X-ray marking instrument showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite side elevational view being a mirror image; and,

FIG. 5 is an end elevational view thereof, the opposite end elevational view being a mirror image. 

The ornamental design for an X-ray marking instrument, as shown and described. 